外文翻譯——基于單片機的紅外防盜報警系統(tǒng)設(shè)計-單片機-全文預(yù)覽
【正文】 infrared radiation energy is bigger also. effect Passive infrared detector also called pyroelectric infrared detector, its main working principle is pyroelectric effect. Pyroelectric effect means if make some strong dielectric material (such as qin batio3, qin wrong acid lead P (zT), etc.) of the surface temperature changes, then with the temperature rise or fall, material surface occurs polarization, namely on the surface of the charge will be produced change, and material surface charge lost balance and eventually charge will change withvoltage or current form output. pyroelectric infrared sensor basic structure Pyroelectric infrared sensors from sensor detection yuan, interference filters and mosfet verifier three parts. According to the number of detecting yuan to points, pyroelectric infrared sensors have unit, double yuanhe four yuan to wait for a few kinds, for human detection of infrared sensor adopts double yuan or four yuan type structure. According to pyroelectric infrared sensor utility cent, have the following kinds: used for measuring temperature sensor, it39。 uninterrupted power supply, According to the system to plete functions, we adopt single chip microputer as the core of the system unit, electronic detection, intelligent control and telephone tong telephone automatic dialup alarm circuit design In order to simplify the whole system design process, we do not adopt MT880 chip dialing. Realization process is as follows: First in telephone storage inside put on domestic host cell phone number or alarm call 110. From MCU pins and drawn two wiring connect relays, a pick telephone keyboard MianDiJian, another connect telephone keyboard keys, automatic weighing dial because the phone keypad scanning is similar microcontroller keypad scanning, so can make SCM give fitst a signal, lets telephone hf, then give the a signal, let relay connected, automatic weighing dial the key a potential, let telephone automatic dialup, so they could finish the system alarm function. system working principle The whole system hardware part mainly includes six parts: MCU module。本設(shè)計就是為了滿足現(xiàn)代住宅防盜的需要而設(shè)計的家庭式電子防盜系統(tǒng)。本系統(tǒng)采用了人體熱釋電紅外傳感器，在人體探測器領(lǐng)域中，被動式熱釋電紅外探測器因其價格低廉、制作簡單、成本低，安裝比較方便，防盜性能比較穩(wěn)定，靈敏度高、安全可靠等特點，備受廣大家庭用戶的歡迎。假定物體 發(fā)射紅外輻射的峰值波長為幾，它的溫度為T，則輻射能量等于紅外輻射的峰值波長戈與物體溫度 T 的乘積。 熱釋電紅外傳感器的基本結(jié)構(gòu) 熱釋電紅外傳感器由傳感探測元、干涉濾光片和場效應(yīng)管匹配器三部分組成。用于人體探測的傳感器，它的工作波長為 7－ 15 腳。當人體處于靜止狀態(tài)時，兩元件極化程度相同，相互抵消 。當有人體突然進入探測區(qū)域時，會造成紅外輻射能量的突然變化，紅外探測器將接收到的活動人體與背景物體之間的紅外熱輻射能量的變化轉(zhuǎn)化為相應(yīng)的電信號，電信號的大小，決定于敏感元件溫度變化的快慢，經(jīng)過后級比較器與狀態(tài)控制器產(chǎn)生相應(yīng)的輸出信號 U。為此，紅外智能防盜報警系統(tǒng)的具體設(shè)計要求為： (1) 完成對高靈敏度紅外傳感器的設(shè)計，使其能對所發(fā)生的警情進行實時、準確的探測。 3. 電話自動撥號功能
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